<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue计数器</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div id="app">
      <button @click="subNum">-</button>
      <span>{{ num }}</span>
      <button @click="addNum">+</button>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="script.js"></script>
  </body>
</html>
